Patents by Inventor Ryousuke Itakura

Ryousuke Itakura has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • Patent number: 6207332
    Abstract: A process for producing a lithographic printing plate which is inexpensive, is not elongated, can be readily handled and can provide a uniform image, is disclosed. The process comprises the steps of: using an original plate for lithographic printing comprising a support having a volume electric resistance of more than 1×1010 &OHgr;·cm, a conductive layer having a volume electric resistance of 1×105 &OHgr;·cm or less, provided on one surface of the support, and a photoconductive layer containing zinc oxide and a binder, provided on the conductive layer, conducting negative corona discharge from the side of the photoconductive layer of the original plate for lithographic printing, and during this corona discharge, contacting a conductor having earth potential with at least the support of the original plate, thereby charging the photoconductive layer of the original plate for lithographic printing.
    Type: Grant
    Filed: December 10, 1997
    Date of Patent: March 27, 2001
    Assignee: Fuji Photo Film Co., Ltd.
    Inventors: Takao Nakayama, Shigeyuki Dan, Ryousuke Itakura, Hideyuki Hattori, Hiroshi Tashiro
  • Patent number: 6096485
    Abstract: A desensitizing solution for lithographic printing is disclosed, which comprises at least one organometallic polymer containing at least two partial structure units represented by the following formula (1): ##STR1## wherein R.sup.0 represents --PO.sub.3 H.sub.2, --OPO.sub.3 H.sub.2 or a salt thereof.
    Type: Grant
    Filed: October 18, 1999
    Date of Patent: August 1, 2000
    Assignee: Fuji Photo Film Co., Ltd.
    Inventors: Seishi Kasai, Ryousuke Itakura, Eiichi Kato
  • Patent number: 5730787
    Abstract: A desensitizing solution for lithography is disclosed which contains at least one member selected from cyclic amine and ammonium compounds each containing specific structures. The desensitizing solution does not cause environmental pollution, is stable to long-term storage, continuous use, and fluctuations in environmental conditions, is effective in reducing the time required for etching treatment, and has excellent desensitization performance.
    Type: Grant
    Filed: February 19, 1997
    Date of Patent: March 24, 1998
    Assignee: Fuji Photo Film Co., Ltd.
    Inventors: Seishi Kasai, Ryousuke Itakura, Eiichi Kato